设为 n 维单位列向量， E 为 n 维单位矩阵，则（）。
A.[img src="https://img.haodaxue.net/uploadimg/ico/2020/0601/1590990363771218.png" />
B.[img src="https://img.haodaxue.net/uploadimg/ico/2020/0601/1590990407178541.png" />
C.[img src="https://img.haodaxue.net/uploadimg/ico/2020/0601/1590990415781330.png" />
D.[img src="https://img.haodaxue.net/uploadimg/ico/2020/0601/1590990423175642.png" />
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正确答案： A 答案分析：无
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